qdev-properties-system.c: Allow vlan or netdev for -device, not both

It is currently possible to specify things like:
	-device e1000,netdev=foo,vlan=1
With this usage, whichever argument was specified last (vlan or netdev)
overwrites what was previousely set and results in a non-working
configuration.  Even worse, when used with multiqueue devices,
it causes a segmentation fault on exit in qemu_free_net_client.

That patch treates the above command line options as invalid and
generates an error at start-up.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index 0eada32dcf..729efa81a2 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -205,6 +205,11 @@ static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
             goto err;
         }
 
+        if (ncs[i]) {
+            ret = -EINVAL;
+            goto err;
+        }
+
         ncs[i] = peers[i];
         ncs[i]->queue_index = i;
     }
@@ -301,6 +306,10 @@ static void set_vlan(Object *obj, Visitor *v, void *opaque,
         *ptr = NULL;
         return;
     }
+    if (*ptr) {
+        error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name);
+        return;
+    }
 
     hubport = net_hub_port_find(id);
     if (!hubport) {